Exhibit 7.1
 
 Year ended December 31,2005
    
    
    2006
    
    
    2007
    
    
    2008
    
    
    2009(thousands constant December 31, 2007 pesos for 2004, 2005, 2006 and 2007and thousands of nominal pesos for 2008, except ratio data)Income (Loss) Before Income Tax
    
    
    213,655
    
    
    
    72,509
    
    
    
    299,631
    
    
    
    (470,361
    )
    
    
    (438,972
    )Determination of the Ratio Fixed charges:Interest expense (1)
    
    
    110,889
    
    
    
    94,093
    
    
    
    233,628
    
    
    
    368,400
    
    
    
    293,225Interest capitalized during period
    
    
    (804
    )
    
    
    71,815
    
    
    
    3,942
    
    
    
    (50,709
    )
    
    
    26,819Rental expense
    
    
    15,717
    
    
    
    21,450
    
    
    
    18,186
    
    
    
    21,011
    
    
    
    24,286Amortization of Debt issuance costs
    
    
    (14,708
    )
    
    
    (137,603
    )
    
    
    5,966
    
    
    
    
    
    
    
    Total fixed charges
    
    
    111,094
    
    
    
    49,755
    
    
    
    261,722
    
    
    
    338,702
    
    
    
    344,330Earnings:Income (loss) from continuing operations
    
    
    213,655
    
    
    
    72,509
    
    
    
    299,631
    
    
    
    (470,361
    )
    
    
    (438,972
    )Fixed charges
    
    
    111,094
    
    
    
    49,755
    
    
    
    261,722
    
    
    
    338,702
    
    
    
    344,330Amortization of capitalized interest
    
    
    (1,920
    )
    
    
    28,852
    
    
    
    16,032
    
    
    
    23,772
    
    
    
    24,342Less: interest capitalized during period
    
    
    804
    
    
    
    (71,815
    )
    
    
    (3,942
    )
    
    
    50,709
    
    
    
    (26,819
    )Total earnings
    
    
    323,633
    
    
    
    79,301
    
    
    
    573,443
    
    
    
    (57,178
    )
    
    
    (97,119
    )Ratio of Earnings to Fixed Charges
    
    
    2.91
    
    
    
    1.59
    
    
    
    2.19
    
    
    
    (0.17
    )
    
    
    (0.28
    )Insufficiency (sufficiency)
    
    
    (212,539
    )
    
    
    (29,546
    )
    
    
    (311,721
    )
    
    
    395,880
    
    
    
    441,448




---



##### 



Year ended December 31,2005
    
    
    2006
    
    
    2007
    
    
    2008
    
    
    2009(thousands constant December 31, 2007 pesos for 2005, 2006 and 2007and thousands of nominal pesos for 2008 and 2009, except ratio data)Income (Loss) Before Income Tax
    
    
    (48,187
    )
    
    
    30,783
    
    
    
    133,178
    
    
    
    (671,457
    )
    
    
    (365,095
    )Determination of the Ratio Fixed charges:Interest expense (1)
    
    
    109,678
    
    
    
    144,038
    
    
    
    232,912
    
    
    
    255,662
    
    
    
    302,035Interest capitalized during period
    
    
    407
    
    
    
    21,870
    
    
    
    4,658
    
    
    
    62,029
    
    
    
    18,009Rental expense
    
    
    15,717
    
    
    
    21,450
    
    
    
    18,186
    
    
    
    21,011
    
    
    
    24,286Amortization of Debt issuance costs
    
    
    37,780
    
    
    
    41,732
    
    
    
    5,966
    
    
    
    
    
    
    
    Total fixed charges
    
    
    163,582
    
    
    
    229,090
    
    
    
    261,722
    
    
    
    338,702
    
    
    
    344,330Earnings:Income (loss) from continuing operations
    
    
    (48,187
    )
    
    
    30,783
    
    
    
    133,178
    
    
    
    (671,457
    )
    
    
    (365,095
    )Fixed charges
    
    
    163,582
    
    
    
    229,090
    
    
    
    261,722
    
    
    
    338,702
    
    
    
    344,330Amortization of capitalized interest
    
    
    881
    
    
    
    1,716
    
    
    
    4,136
    
    
    
    11,654
    
    
    
    23,826Less: interest capitalized during period
    
    
    (407
    )
    
    
    (21,870
    )
    
    
    (4,658
    )
    
    
    (62,029
    )
    
    
    (18,009
    )Total earnings
    
    
    115,878
    
    
    
    239,719
    
    
    
    394,378
    
    
    
    (383,130
    )
    
    
    (14,948
    )Ratio of Earnings to Fixed Charges
    
    
    0.71
    
    
    
    1.05
    
    
    
    1.51
    
    
    
    (1.13
    )
    
    
    (0.04
    )Insufficiency (sufficiency)
    
    
    47,704
    
    
    
    (10,629
    )
    
    
    (132,656
    )
    
    
    721,833
    
    
    
    359,278